You may have seen a video floating around which shows the original Super Mario Bros., but with a new set of modern, "more realistic" sound effects.
And as it turns out, that isn't the only game to get the new sound treatment. Following is a video compilation of many games, each with its own new set of sound effects, and that of course includes a few clips from Mega Man.

Just be sure not to blink, or you'll miss them:

The man responsible for these videos, Jake Kaufman, has worked on music and sound effects for a number of titles, including several WayForward releases (such as Shantae: Risky’s Revenge, Batman: The Brave and the Bold: The Videogame, and Contra 4), among other chiptune and arranged soundtracks. To find out more, be sure to visit his page, Big Lion Music.